Question

oxidation - reduction reactions

• transfer electrons from one molecule to another.
• are not used by living cells.
• transfer protons from one molecule to another.
• reduce the amount of oxygen in the cell.
• increase the amount of oxygen in the cell.

Explanation:

Oxidation - reduction (redox) reactions are defined by the transfer of electrons between molecules. In a redox reaction, one molecule is oxidized (loses electrons) and another is reduced (gains electrons). Living cells do use redox reactions (e.g., in cellular respiration). Transferring protons is related to acid - base reactions, not redox. Redox reactions are not primarily about changing the amount of oxygen in the cell (though oxygen can be involved in some redox reactions, the core is electron transfer). So the correct statement is that they transfer electrons from one molecule to another.

Answer:

A. transfer electrons from one molecule to another.